user_can_access_admin_page not recognising taxonomies

[ClementN]

Hello,

I have a custom taxonomy with custom capabilities.
The "edit_customtaxonomy" cap is removed from all roles.

The problem is that the user is still able to click on each term (in the taxonomy page).
When each term is clicked, the user goes to the "Update term" page and he is able to click the "Update" submit button.

After all, he can't update and get a "cheatin huh?" message.

The problem is they should't have access to the update page from the first place.

This happens for any taxonomy, not just custom defined ones (try visiting edit-tags.php?taxonomy=category as a subscriber). The root of the problem is that user_can_access_admin_page() is not recognising the edit-tags.php?taxonomy=TAX_NAME entry in $_wp_submenu_nopriv since the pagenow global is set to edit-tags.php (note lack of query string).

Quick fix patch (not addressing problem described above) emulates behaviour in edit.php; implements a secondary check after the check in menu.php should deny access.

NB: the the links are all being removed from the menu, talking about visiting the URL directly as a user without the correct privileges.

(In [15439]) Add cap check. Props duck_. see #14343

(In [15440]) Add cap check. Props duck_. see #14343 for 3.0.1

(In [15441]) Add cap check. see #14343

(In [15442]) Add cap check. see #14343

user_can_access_admin_page() should never be relied upon. It is a fallback. We can look into fixing it for pages that have query args in 3.1.

@ryan: what do you want to do about this one? Stick with quick fix for 3.1 and revisit in 3.2, or will someone patch for 3.1 in time?